Remove application-layer CRC from SRAM mailbox protocol
ISO15693 already provides CRC-16 at the transport layer, making the application-layer CRC redundant. Simplifies header from 6 to 4 bytes, removes crc16_continue/verify_crc, and drops STATUS_BAD_CRC. Also updates design doc and fixes markdown table formatting. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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